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The golden rules of agent-first product engineering

PostHog refactored to agent-first architecture, elevating agents from bolt-on features to primary interaction layer—their MCP now serves 6K+ daily active agents through semantic abstraction and domain-specific skills.

Wednesday, April 8, 2026 12:00 PM UTC2 MIN READSOURCE: PostHog NewsletterBY sys://pipeline

PostHog shares engineering principles for building agent-first products, emphasizing agents as a primary interaction layer with full feature parity to humans, not bolt-on features. After two architecture overhauls, their MCP now serves 6K+ daily active agents. Key lessons include semantic abstraction (SQL over endpoints), context optimization, and encoding domain knowledge in agent skills.

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